Disk-sharpener.



J. n, STEWART. DISK SHARPBNBR. APi'LIOATION FILED AUG. 16, 1912.

Patented Jan. 13,1914.

2 SHEETS-SHEET 1. Q

llllllllllllllllllllllllllllllfl'll SW01 013271101)- Jbwa fi UNITED STATES PATENT orruon JOHN D. STEWART, OF GLENWOODVILLE, ALBERTA, CANADA.

DISK-SHARPENER.

. Specification of Letters Patent.

- Patented Jan. 13, 1914.

' Application filed August 16, 1913. Serial N... 785,169.

useful Improvements in Disk-Sharpeners,-of

which the following is a specification.

This lnvention is an improved disk sharp- .ener especially adapted for grinding harrow and plow disks and other like devices,

- the object of the invention being to provide an improved machine of this character which automatically turns the disk while the machine is in operation so as to present all portions of the periphery of the disk successivelv to the action of the grinding stone,

another object being to simplify the construction of the machine.

With the above and other objects in view, the invention consists in the construction,

' combination and arrangement of devices ,vation of the 'same.

hereinafter described and claimed.

In the accompanying drawings :Figure l is a front elevation of a disk harpener constructed in accordance with my invention, showing the same arranged for operation on a harrow disk. Fig. 2 is a side ele- Fig. 3 is a vertical longitudinal sectional view of the same. Fig.

4- is a detail plan of the boxing, the supportmg arm therefor, the-driving shaft and one of the work revolving gears, and showing the vertical work carrying shaft in section.

Fig. 5 is a similar view of the supporting bracket of the .roller and its connections, showlng' the'post in horizontal cross section and also showing thearm which carries said roller in cross section. .1

My improved disk sharpener is here shown as having a suitable supporting base 1 and a standard 2. A horizontally arranged arm 3 is at the upper end of the standard and extends from the rear side thereof, A cross bar-4 is directly at the upper end of the "standard and is arranged at riszht angles to -bar or arm 3. A vertically arranged casing 5. comprises a body 6 open at its front sideand a cover 7 to close the front side of the body.

The lower end of the body of the casing 2 at the upper end thereof so that the said body of the casing rises from said standard .-;and in-the upper portion of the body of the .caising is a bearing 8 for a short shaft 9 which is-provided at its rear end with fa shaft for grinding.

grind stone or disk 10 which, in practice, is preferably made of carborundum but which maybe made of any suitable material and may be of any suitable size. On the front end of the said shaft is a spur gear 11. An axle 12 of a small gear 13 and a large gear 14 has its hearings in the body and cover of the casing. The gear 14: engages the gear 11 and the gear 13 engages a driving gear 15 which is provided with a hand crank, the said hand crank being fast' on a shaft 17 which has bearings in the standard 2 and also has a bearing in a bracket 18 which depends from a boxing 21 on the arm 3. A bevel gear 19 is splined on the shaft 17 for rotation therewith and for longitudinal adjustment thereon, a set 'screw 20 being provided to secure the said beveled gear at any desired adjustment on the shaft.

The boxing 21 is mounted on the arm 3 for longitudinal adjustment thereon and has a bearing 22 for a vertical shaft 23. At the lower end of the shaft 23 is a large beveled gear wheel 24: which is engaged by the beveled gear or pinion 19. A lower cushioning spring 25 is arranged on the shaft 23 at a point above the bearing 22 and supports a washer 26 which is adapted to bear against the under side of a disk A arranged on the A spring 2'? is arranged on the upper portion of the shaft 23 and bears on the upper concaved face of the disk and is held in place by a nut 28 screwed on the threaded upper portion of the shaft. The springs 2527 while serving to hold the disk at the correct elevation for grinding by the stone or disk 10 permit of slight vertical movement of said disk as is required while grinding the same. A post 29 projects upwardly from the crossbar 4: and is provided with a bracket 30 which is vertically adjustable thereon and may be secured at any desired adjustment by a set screw 31.

A substantially U-shaped arm 32 has the upper ends of its members pivotally connected to the bracket 30 as at 33 for vertical angular adjustment, the said arm 32 carrying a roller 34 which is adapted to bear on the upper side of the harrow disk at a point above the grind stone or disk 10.

It will be understood that when the shaft 17 is rotated-by the crank 16, the tram of gears hereinbefore described causes the grinding disk or-stone 10 to be revolved and to sharpen the edge of the harrow disk and it will also be i'inderstood that the gears 2024 cause theshaft 23 which carries the harrow disk to be also slowly rotated so that all portions of the edge of the harrow disk are successively presented to the grinding action of the stone or disk 10.

While I have herein shown and described a preferred form of my invention, I would have it understood that changes may be made in the form, proportion and construction of the several parts without departing from the. spirit of my invention and within the scope of the appended claims. 1

I claim 1. The herein described disk sharpener comprising asupporting standard, an'a-rm extending horizontally from the standard, a boxing mounted for longitudinal movement on said arm, a vertical work revolving shaft mounted in a bearing in said boxing and having a beveled gear at its lower end, a

driving shaft mounted in bearings in the standard and in a bearing with which the boxing is provided, said shaft being parallel with said arm and having an adjustable beveled pinion engaging said beveled gear, a revoluble grinding element, a support and a bearing therefor, connections betwe n the driving shaft and grinding element to rotate the latter, a vertical post extending from the upper end ofthe standard, a bracket adjustable on said post, an arm pivotally connected to said bracket and a roller mounted in said arm and arranged to engage the work at a point above the grindin element.

2. In a disk sharpener of the class described, the combinati n of a support, a

driving shaft mounte in the support, a grinding element connections between the driving shaft and grinding element to rovtate the latter, a work carrying shaft arranged at an angle to the driving shaft and geared thereto, a roller arranged to engage. 

